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What is the % composition of high speed steel?

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What is the % composition of high speed steel?

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  1. *Find the composition of different types of HSS at:

    http://en.wikipedia.org/wiki/High_speed_...

    *High speed steels belong to the Fe-C-X multicomponent alloy system where X represents chromium, tungsten, molybdenum, vanadium, and/or cobalt. Generally, the X component is present in excess of 7%, along with more than 0.60% carbon. (However, their alloying element percentages do not alone bestow the hardness-retaining properties; they also require appropriate high-temperature heat treatment in order to become true HSS.)

    The grade type T-1 with 18% tungsten has not changed its composition since 1910 and was the main type used up to 1940, when substitution by molybdenum took place. Nowadays, only 5-10% of the HSS in Europe and only 2% in the United States is of this type.

    The addition of about 10% of tungsten and molybdenum in total maximises efficiently the hardness and toughness of high speed steels and maintains these properties at the high temperatures generated when cutting metals.

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